I think that's going a bit too far. Children, certainly... but teens? Come on, they may be morons... but not delusional. I think you can allow 16 year-olds to buy that game, or 18 year-olds. Besides, who's to say a 20 year-old is more stable than a 16 year-old? You can never know...Children and teenagers often aren't mature enough to draw a solid line between reality and fantasy.
I think the fact a game creates such noise, solely for the fact it's violent, says something... when a kid murderer's parents blame a freaking comuter game, instead of sitting with their head between their knees and thinking about the monster of a child they've created... something is definitely wrong.
These things just incite what already exists in people - bringing it into the surface, making it visible. We don't like that, it scares us. There was some book, in the 19th century, I think... it dealt with suicide and stuff.. and lots of people killed themselves, back then. Same goes for this - it just triggers something in sick, weak people. Frankly, I don't think the problems lies only within the medias themselves (be it Clockwork Orange, Manhunt, etc), but rather, the way society adjusts.
Parents no longer educate their children. There are no boundries... kids, and then adults, are lost. Lost in anxiety, sexual temptations, violent atmsopheres... it's all a haze. I think, those things are very hard to eradicate or weaken, without creating a very strict and depressive society (i.e, banning, censoring, etc), and what must be done is ADJUSTMENT.
